Stocks are heading lower today, and one measure suggests there might not be a late day comeback.

By

Ben Levisohn

Aug. 10, 2017 11:10 a.m. ET

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By

Ben Levisohn

Aug. 10, 2017 11:10 a.m. ET

The S&P 500 is headed for its largest drop in more than a month as stocks wobble on continued North Korea tensions.

The S&P 500 has fallen 0.8% to 2,454.20 at 11:04 a.m. today, while the Dow Jones Industrial Average has declined 120.68 points, or 0.6%, to 21,928.02. The Nasdaq Composite has dropped 1.1% to 6,282.71.

Brown Brothers Harriman's Marc Chandler and team contend that "It is difficult to walk back the...